Spiral casing for water-turbines.



A. HUGUENIN.

SPIRAL CASING FOR WATER TURBINES.

APPUCATION FI LED APR. 28. I914.

Patented Sept 4. 1917'.

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ALBERT HUGUEIVIN, F ZURICH, SWITZERLAND, ASSIGNOR T0 AKTIENGESELLSCHAFT DER MASCHININFAIBRIKEN ESCHER, 86 CO., 0]? ZURICH, SWITZERLAND, A

CORPORATION OF SWITZERLAND.

SPIRAL CASING- FOR WATER-TURBINES.

Specification of Letters Patent.

lPatented'Sept. 4t, 1191?.

Application filed April 28, 1914:. Serial No. 834=,930.

' ing at Hardturmstrasse'li), Zurich, Switzerland, have invented'certain new and useful Improvements in Spiral Casingsffor Water- Turbines; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which 1t appertains to make and use the same, reference 'being had to the accompanying drawing,

and to letters or figures of reference marked thereon, which form a part of this speeification.

This invention relates to improvements in spiral casings for water-turbines. The wall of the casing is built up of a number of iron-plates meeting one another, the plates being connected in a-p'articular manner and being so arranged to form a casing havlng a round cross-section.

The object of this construction is to obtain a great saving of bracings and in the thickness of the iron-plates as compared with the known casings for water-turbines built up of a number of iron-plates, so that the weight and the priceof such a casing may be considerably reduced; A'further object of this invention is to provide a very strong casing, notwithstanding the savings in bracings and material.

According to one embodiment of=this invention the iron-plates, of which-the casing is built up and which meet one another inclose an obtuse angle and said plates are on their edge inwardly bent to such an extent in relation to their corresponding middle; axis, that they can be fastened together by means of a connecting piece applied from the outside and placed as a butt-strap over the joint of two adjoining iron-plates, said connecting piece tightening at the same time the joint. The connecting piece may be flat or, whatis still better, it may have a T- shaped cross-section, so that it acts as a very strong bracing, this being particularly advantageous when the casing is very large. The ends of the iron-plates lying nearer the axis of the turbine are supported by means of cast ring-pieces.

Several forms of carrying the invention into efi'ect are shown by way of example in the accompanying drawing in which:

Figure 1 shows a partial vertical crosssection of the casing at right angles to the axis of the turbine and a partial front elevation of the casing,

Fig. 2 shows a horizontal section on the I line'III of Fig.1 and Figs. 3, 4, 5 and 6 show the parts III, IV,

V and VI of the casing on'an enlarged scale to' illustrate howv two iron-plates meet one another and show the special connecting pieces of different shape serving for fastening together said adjoining iron-plates.

In carrying the invention into eifect as shown in Fig. 1 the water enters from below at a into the casing and is distributed in the latter in a clockwise direction. The casing is built up of iron-plates b to 30 forming a casing having substantially a round crosssection. As already stated, Fig. 2 illustrates a section on the line III of Fig. 1, the casing parts I; and 2' being shown in crosssection. In this cross-section the iron-plate Z2 extends from the point 1 over point 2 to the point 3 and it has substantially the shape I of a circular cylinder. straight from 1 to 1 and from 5 to 3 and they are supported at l and 3 by means of a cast ring, which consists of the two lateral disks r and s and the transverse rib t.

In order to connect two adjoining ironplates (for instance-:7; and c), the ends of these plates are inwardl bent in relation to Only the ends are the direction of the mlddle axis A-B respectively B-(l of the casing to such an extent, that they may be connected by means of a flat band to extending all around the casing and riveted, welded or screwed to said twoplates (see Fig. 3). The joint existing between these two iron-plates b and a may be made tight by calking the band it to 1 said two plates.

Instead of'using a band a the two ironplates meeting one another may also be connected by' means of a circular angle-iron. Fig. 1 shows such a connection consisting of angle irons a) and w between two casingplates 6 and 7". Such a connection may be detachable and it permits to subdivide the casing.

At the point IV of Fig. 1 and on an enlarged scale in Fig. 4 there is shown how the iron-plates d and e ma be fastened together by means of a ban n: having a T- shaped cross-section.

When a connection of the type illustrated in Fig. 5 is used it is not necessary to bend the edges of the iron-plates f and g to be connected out of the direction of these plates. According to the construction illustrated in this figure the band-like butt-strap 3/ has a roof-like cross-section and it is so shaped to fit the ends of the iron-plates meeting one another. It is evident, that also a T-shaped connecting piece a (see Fig. 6) may have a cross-section of such a shape to fit the ends of the iron-plates h and i, which "ends are not bent out of the direction of theseplates.

lVhat I claim is:

1. In a spiral casing for turbines, the combination with a pair of adjacent casing elements whose axes make an angle with one another and whose ends abut and constitute one part of a casing joint; of astrap overlapping the abutting ends and constituting the other part of said joint said parts constructed and arranged to form contacting fitted surfaces.

2. In a spiral casingfor turbines, the combination with a pair of casing elements having abutting ends which constitute one part of a casing joint; of a strap overlapping said abutting ends and constituting the other part of the casing joint, one of said parts being bent to form a contacting surface fitting the other part and said strap se--,

cured to said abutting ends.

3. A spiral casing comprising two unalined casing elements having their edges opposed, a connecting element overlapping said edges, one of said elements being bent to form contacting surfaces with all the elements.

4. A spiral casing for turbines, comprising adjacent sheet metal sections at an angle to one another having their abutting ends bent inwardly to lie in the same cylindrical surface, and a strap overlapping and fitting the bent ends of abutting sections.

5. A spiral casing for turbines, comprising adjacent sheet metal casing elements whose axes form an angle with one another, a peripherally divided two-part strap overlapping the adjacent ends of said elements,

said strap and ends of the adjacent elements being constructed and arranged to form contacting fitted surfaces.

In testimony that I claim the foregoing as my invention, I have signed my name in presence of two subscribing witnesses.

ALBERT HUGUENINQ Witnesses CARL GUBLER, ORNOLD LEHNER. 

